2003 Jeep Wrangler Throttle Position Sensor

Tiny
MTHAYER
  • MEMBER
  • 2003 JEEP WRANGLER
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I`ve been having problems with my throttle position sensor going out. I was wondering what could cause the sensor to go bad and I have changed it twice. We thought maybe the harness was causing the problem. I was told by a car repair guy the PCM might be bad too. Some of the codes are PO122 and sometimes PO123. Please help the Jeep is for a mail route that is 75 miles long.
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Thursday, June 19th, 2014 AT 2:55 PM

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Tiny
CARADIODOC
  • EXPERT
P0122 - Throttle/Pedal Position Sensor/Switch A Circuit Low Input
P0123 - Throttle/Pedal Position Sensor/Switch A Circuit High Input

This is the same sensor design that has been used by Chrysler and other manufacturers for decades, and has an extremely low failure rate. There's nothing you can do to cause it to fail. Given the two codes, it is much more likely there's a corroded or stretched terminal in the connector or a corroded splice. A break in the 5.0 volt feed wire circuit will cause the first code. A break in the ground wire or circuit will cause the second one. Either code could be caused by a break inside the sensor, but one break is uncommon, two different breaks is very unlikely, and to happen with multiple sensors isn't going to happen.

The ground and 5.0 volt feed circuits are shared with other sensors so in most cases a problem with them will set codes for additional sensors. A break in the signal wire will make the voltage seen by the computer go to 5.0 volts and set the second code. To also get the first code might suggest that wire has rubbed through and is grounding to the body intermittently. I'd start with a good visual inspection of the wiring harness.
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Thursday, June 19th, 2014 AT 10:04 PM
Tiny
MTHAYER
  • MEMBER
Thank you for your answers, I went to the jeep dealership and was told it needed a clock spring and an oil sending unit but I do thank you for you answers.
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Friday, June 20th, 2014 AT 4:29 PM
Tiny
CARADIODOC
  • EXPERT
How did they come up with the clock spring? That's a wound-up ribbon cable in a plastic housing under the steering wheel. When that cable breaks you'll lose the cruise control, horn, and the Air Bag warning light will turn on. It doesn't have anything to do with the throttle position sensor.
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Friday, June 20th, 2014 AT 9:56 PM

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